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我得到这个异常，“无法在未调用 Looper.prepare() 的线程内创建处理程序”，当我调用 get 或 getFriends 时抛出。这是我用于 getFriends 的代码。它是从主线程调用的。

public void returnFriendIDs(final int pointer){
    Properties properties = new Properties.Builder()
                .add(Profile.Properties.ID)
                .add(Profile.Properties.FIRST_NAME)
                .add(Profile.Properties.LAST_NAME)
                .add(Profile.Properties.INSTALLED)
                .build();

    try{
        mSimpleFacebook.getFriends(properties,  new OnFriendsListener() {
            @Override
            public void onComplete(List<Profile> friends) {
                String resultStr = "";
                Log.d(LOGPREFIX, "Number of friends = " + friends.size());
                for(Profile p : friends){
                    resultStr += p.getId()+',';
                }
                if(friends.size() > 0) returnFriends(pointer, resultStr.substring(0,resultStr.length()-1));
                else returnFriends(pointer, "");
            }

            @Override
            public void onFail(String reason){
                returnFriends(pointer, "");
            }

            @Override
            public void onException(Throwable throwable){
                Log.w(LOGPREFIX, throwable.getMessage());
                returnFriends(pointer, "");
            }
        });
    }
    catch(Throwable throwable){
        Log.w(LOGPREFIX, "In getFriends"+throwable.getMessage());
    }
}

我曾尝试在调用 getFriends 之前调用 Looper.prepare()，但这只会导致没有任何回调被调用。

我的 onActivityResult 函数是

@Override
    protected void onActivityResult(int requestCode, int resultCode, Intent data)
    {
        //Log.w(LOGPREFIX, "onActivityResult() called.");
        mSimpleFacebook.onActivityResult(this, requestCode, resultCode, data);

        // Handle InApp Purchase call results
        if(REQUEST_INAPP_PURCHASE == requestCode)
        {
             if (!mBillingHelper.handleActivityResult(requestCode, resultCode, data)) {
                 super.onActivityResult(requestCode, resultCode, data);
             }
        }
    }

堆栈跟踪是：

Pending exception java.lang.RuntimeException thrown by 'unknown throw location'
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
  at void android.os.Handler.<init>(android.os.Handler$Callback, boolean) (Handler.java:200)
  at void android.os.Handler.<init>() (Handler.java:114)
  at void com.facebook.RequestAsyncTask.onPreExecute() (RequestAsyncTask.java:146)
  at android.os.AsyncTask android.os.AsyncTask.executeOnExecutor(java.util.concurrent.Executor, java.lang.Object[]) (AsyncTask.java:587)
  at android.os.AsyncTask android.os.AsyncTask.execute(java.lang.Object[]) (AsyncTask.java:535)
  at void com.sromku.simple.fb.actions.GetAction.runRequest(com.facebook.Request) (GetAction.java:143)
  at void com.sromku.simple.fb.actions.GetAction.executeImpl() (GetAction.java:81)
  at void com.sromku.simple.fb.actions.AbstractAction.execute() (AbstractAction.java:17)
  at void com.sromku.simple.fb.SimpleFacebook.getFriends(com.sromku.simple.fb.entities.Profile$Properties, com.sromku.simple.fb.listeners.OnFriendsListener) (SimpleFacebook.java:594)
  at void com.fillmyblank.app.FillMyBlank.returnFriendIDs(int) (FillMyBlank.java:325)
  at void org.libsdl.app.SDLActivity.nativeInit() (SDLActivity.java:-2)
  at void org.libsdl.app.SDLMain.run() (SDLActivity.java:509)
  at void java.lang.Thread.run() (Thread.java:818)

它是从我的主函数（我相信它是 UI 线程）中用这段代码调用的。我使用 ndk，所以 main 函数是指实际的 main 函数。

    aEnv = (JNIEnv *)SDL_AndroidGetJNIEnv();

    aActivityClass = aEnv->FindClass(mClassPath.c_str());

    aStaticMid = aEnv->GetStaticMethodID(aActivityClass, "GetActivity", "()Lcom/fillmyblank/app/FillMyBlank;");
    aActivity =  aEnv->CallStaticObjectMethod(aActivityClass, aStaticMid);

    friends* fp = new friends;
    fp->waiting = SDL_CreateCond();

    aJavaMethodID = aEnv->GetMethodID(aActivityClass, "returnFriendIDs", "(I)V");

    aEnv->CallVoidMethod(aActivity, aJavaMethodID, fp);

编辑：添加堆栈跟踪

编辑：添加了调用功能。

4

1 回答 1

2

说明

在 Facebook 库 ( )的onPreExecute一部分中抛出异常。AsyncTaskcom.facebook.RequestAsyncTask

onPreExecute在与 AsyncTask 的调用者相同的线程中执行。如果调用者是 ui 线程，没问题，它会工作。如果调用者不是 ui 线程，它可能会失败（很有可能）。如果使用了 ui 的任何组件或与 ui 相关的任何组件，都会失败。

在您的情况下，它不是在 ui 线程中执行，而是在没有消息循环的常规线程中执行，因此抛出了这个著名的异常：Can't create handler inside thread that has not called Looper.prepare()

解决方案

您必须使用runOnUiThread方法来确保您的代码在 ui 线程中执行。runOnUiThread将 aRunnable作为参数。

public void returnFriendIDs(final int pointer)
{
    runOnUiThread(new Runnable()
    {
        @Override
        public void run()
        {
            Properties properties = new Properties.Builder()
            .add(Profile.Properties.ID)
            .add(Profile.Properties.FIRST_NAME)
            .add(Profile.Properties.LAST_NAME)
            .add(Profile.Properties.INSTALLED)
            .build();

            try{
                mSimpleFacebook.getFriends(properties,  new OnFriendsListener() {
                    @Override
                    public void onComplete(List<Profile> friends) {
                        String resultStr = "";
                        Log.d(LOGPREFIX, "Number of friends = " + friends.size());
                        for(Profile p : friends){
                            resultStr += p.getId()+',';
                        }
                        if(friends.size() > 0) returnFriends(pointer, resultStr.substring(0,resultStr.length()-1));
                        else returnFriends(pointer, "");
                    }

                    @Override
                    public void onFail(String reason){
                        returnFriends(pointer, "");
                    }

                    @Override
                    public void onException(Throwable throwable){
                        Log.w(LOGPREFIX, throwable.getMessage());
                        returnFriends(pointer, "");
                    }
                });
            }
            catch(Throwable throwable){
                Log.w(LOGPREFIX, "In getFriends"+throwable.getMessage());
            }
        }
    });
}
于 2014-12-29T13:32:03.100 回答